CDLL975B

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Diodes, either discrete or integrated, are commonplace components used in all sorts of electrical circuits. A Zener diode is a special type of diode that has a structure that allows it to be reverse-biased beyond its breakdown voltage. The CDLL975B is a single Zener diode in a miniature SOD-323 package designed to provide an economical solution for low-power applications. The CDLL975B has a wide range of applications, from circuit protection to voltage regulation.

The CDLL975B is a PN junction diode with an N-doped region and P-doped region to create the junction. The P-region has a higher concentration of charge carriers (electrons and holes), which means that it has a lower resistance and electrons can move more easily across the junction. When the anode (positive end) is forward biased, the electrons flow from the N-region to the P-region, creating a 1N5181 or 1N4751 diode.

The reverse-biased breakdown voltage of the CDLL975B is between 5.1 to 6.75 volts with a current rating of 200mA. As the reverse bias exceeds the breakdown voltage, the junction becomes more conductive and a current begins to flow. The reverse-biased current is typically small (about 5uA) due to the limitation of the junction structure. The reverse-biased current-voltage characteristics of the CDLL975B is shown in Figure 1.

The CDLL975B is typically used as a form of circuit protection device. When used in this manner, the breakdown voltage of the diode is selected to match the maximum operating voltage of the circuit. If the voltage in the circuit exceeds the breakdown voltage, the Zener diode will conduct and the excess voltage will be diverted away, thus protecting the circuit components.

The CDLL975B can also be used as a voltage regulator. In this application, the breakdown voltage is used to set the output voltage of the regulator. The current drawn from the diode is used to adjust the output voltage in order to maintain a constant output voltage level. This type of regulator is commonly used in battery operated systems where it is important to maintain a consistent output voltage level.

In summary, the CDLL975B is a single Zener diode in a SOD-323 package. It is used for both circuit protection and voltage regulation applications. The breakdown voltage of the diode is between 5.1 and 6.75 volts and the current rating is 200mA. The diode has a low reverse-biased current of about 5uA, which is useful for regulating the voltage in battery operated systems.

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